A plasma flame catalytic activated coal powder burner for cement plants

Abstract

A plasma flame catalytic activation coal powder burner for cement plants comprises a multi-channel coal injection pipe and a plasma flame catalytic device. The multi-channel coal injection pipe is provided with at least an inner wind duct, a coal powder channel and an outer wind duct, and the plasma flame catalytic device is arranged in the inner wind duct. The plasma flame catalytic device arranged in the inner wind duct (cyclone duct) generates a plasma flame outside the cyclone duct outlet to catalytically activate the coal powder by extruding and rubbing the coal powder coming out of the coal powder channel in an outward rotation, forming a two-phase fuel, increasing the coal powder temperature and catalytically activating the coal powder, thereby improving the coal powder combustion efficiency and the burnout rate of inferior coal powder.

Description

Technical Field

[0001] The invention relates to a pulverized coal burner, in particular to a plasma flame catalytic activation pulverized coal burner used in cement plants. Background Art

[0002] As we all know, cement production is a high-energy-consuming and high-pollution industry, and my country is the world's largest cement production country. There are currently more than 1,700 dry-process cement production lines in operation. The advanced pulverized coal burners commonly used are generally 3-channel to 6-channel pulverized coal burners. Due to the source of coal quality or economic cost reasons, the coal used by cement companies currently has poor combustion performance and reactivity. In addition, the physical functional bottlenecks of the existing advanced pulverized coal burners have resulted in less than ideal timely burnout rate of pulverized coal, high coal consumption, and large side effects on the stable operation of the kiln system caused by the non-timely combustion of pulverized coal. In order to improve the timely burnout rate of pulverized coal, some cement plants have to use oxygen-enhanced devices to implement oxygen-enhanced combustion in order to improve the reactivity and timely burnout rate of pulverized coal. However, the use of this oxygen-enhanced combustion method not only requires increased equipment investment, oxygen consumption during operation, but also increased energy consumption, and has low efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a multi-channel pulverized coal burner with simple structure, good safety, which can improve the combustion speed and timely burnout rate of pulverized coal in cement plants, and can achieve stable combustion by catalytic activation of pulverized coal by plasma flame without the need for oxygen addition.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a plasma flame catalytic activation coal powder burner for cement plants, comprising a multi-channel coal injection pipe and a plasma flame catalytic device, wherein the multi-channel coal injection pipe is provided with at least an inner wind duct, a coal powder channel and an outer wind duct, and the plasma flame catalytic device is arranged in the inner wind duct. The plasma flame generated by the plasma flame catalytic device arranged in the inner wind duct (cyclone duct) rotates outward outside the outlet of the cyclone duct to squeeze and rub the coal powder coming out of the coal powder channel to achieve catalytic activation of the coal powder.

[0005] When the amount of wind and coal is small during the ignition process of the coal injection pipe, a stable rotating plasma flame flow is formed at the swirl outlet of the inner wind duct, which can directly catalyze and activate the coal powder sprayed out of the coal powder channel to ignite; when the coal injection pipe is working normally and the amount of wind and coal is large, the plasma flame flow generated by the plasma flame catalytic device rotates outside the swirl outlet of the inner wind duct to squeeze, friction, catalyze and activate the coal powder, forming a two-phase fuel, increasing the coal powder temperature and catalytically activating the coal powder, thereby improving the coal powder combustion efficiency and the burnout rate of inferior coal powder.

[0006] Furthermore, the multi-channel coal injection pipe includes 3 to 6-channel coal injection pipes.

[0007] Furthermore, the plasma flame catalytic device includes a discharge component, a conductive component and an insulating component. At least one end of the discharge component is located in the inner wind duct. The insulating component is connected to the discharge component and is used to fix the discharge component and isolate the conductive component.

[0008] Furthermore, the discharge component is installed on the inner wall of the inner wind duct and / or at the end of the inner wind duct and / or at the outlet of the inner wind duct.

[0009] Furthermore, the air duct wall of the inner air duct of the plasma flame catalytic device is a conductive component, or the conductive component is installed on the air duct wall of the inner air duct.

[0010] Furthermore, the plasma flame catalytic device also includes a power supply device, which is respectively connected to the discharge component and the conductive component, or one end of the power supply device is connected to the discharge component and the other end is grounded to the conductive component. When the power supply device supplies power, a high-voltage arc can be formed between the discharge component and the conductive component.

[0011] Furthermore, the plasma flame catalytic device is an independent plasma torch installed at the end of the inner wind duct.

[0012] Furthermore, the pulverized coal burner is also provided with a magnetic control component, which is composed of an electromagnetic coil or a permanent magnetic material, and which uses electromagnetic force to directionally push the generated plasma to the outlet of the inner wind duct.

[0013] Compared with the prior art, the present invention breaks through the physical functional bottleneck limitations of existing pulverized coal burners, can improve the combustion efficiency and timely burnout rate of pulverized coal, and reduce heat consumption; the flame formed is concentrated and powerful, which can improve the output of the kiln and the quality of clinker; the pollutants generated by the non-timely combustion of pulverized coal are greatly reduced; it has strong adaptability to coal quality fluctuations in production, and solves the problem of cement kilns being limited in burning low-quality coal; it is beneficial to the stable operation of the dry cement production line and is convenient for improving and transforming the existing pulverized coal burners. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0015] Figure 2 for Figure 1 A schematic diagram of the local structure of AA in Example 1 is shown;

[0016] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0017] Figure 4 for Figure 3 A schematic diagram of the local structure of BB in Example 2 is shown;

[0018] Figure 5 for Figure 3 A schematic diagram of the local structure of CC in Example 2 is shown;

[0019] Figure 6 This is a schematic diagram of the structure of embodiment 3 of the invention;

[0020] Figure 7 for Figure 6 A schematic diagram of the local structure of DD in Example 3 is shown;

[0021] Figure 8 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0022] Fig. 9 for Figure 8 A schematic diagram of the local structure of EE in Example 4 is shown;

[0023] Fig.10 Figure 8 A schematic diagram of the discharge component in Example 4 is shown.

[0024] In the figure, 1-multi-channel coal injection pipe, 10-central air duct, 11-inner air duct, 12-coal powder channel, 13-outer air duct, 14-inner wall of inner air duct, 15-end of inner air duct, 16-exit of inner air duct, 2-plasma flame catalytic device, 21-discharge component, 22-conductive component, 23-insulating component, 25-magnetic control component. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Reference Figure 1-2 The present embodiment comprises a multi-channel coal injection pipe 1 and a plasma flame catalytic device 2. The multi-channel coal injection pipe is a four-channel pulverized coal burner (i.e., a coal injection pipe). The multi-channel coal injection pipe 1 is provided with a central air duct 10, an inner air duct 11 (i.e., a swirl air duct), a pulverized coal channel 12, and an outer air duct 13 (i.e., an axial flow air duct). The plasma flame catalytic device 2 is arranged in the inner air duct 11 (swirl air duct). When working, the plasma flame generated by the plasma flame catalytic device 2 arranged in the inner air duct 11 (swirl air duct) rotates outward outside the outlet of the inner air duct 11 to squeeze and rub the pulverized coal coming out of the pulverized coal channel to realize catalytic activation of the pulverized coal.

[0027] When the amount of wind and coal is small during the ignition process of the coal injection pipe, a stable rotating plasma flame flow is formed at the swirl outlet of the inner wind duct 11, which can directly catalyze and activate the coal powder sprayed from the coal powder channel 12 to ignite; when the coal injection pipe is working normally and the amount of wind and coal is large, the plasma flame flow generated by the plasma flame catalytic device rotates outside the swirl outlet of the inner wind duct 11 to squeeze, friction, catalytically activate the coal powder, and form a two-phase fuel, which directly increases the temperature of the coal powder and catalytically activates the coal powder, thereby improving the combustion efficiency of the coal powder and the burnout rate of inferior coal powder.

[0028] The plasma flame catalytic device 2 includes a discharge component 21, a conductive component 22 and an insulating component 23. One end of the discharge component 21 is located in the inner wind duct 11 (swirl duct), and the other end is fixed to the burner inner wind duct wall 14 through the insulating component 23. The conductive component 22 is formed by the inner wind duct wall 14.

[0029] The plasma flame catalytic device 2 further includes a power supply device (not shown in the figure), which is connected to the discharge component 21 and the conductive component 22 respectively. Power can be supplied by the power supply device to form a high-voltage arc between the discharge component 21 and the conductive component 22.

[0030] Example 2

[0031] Reference Figure 3-5 In this embodiment, the discharge component 21 of the plasma flame catalytic device 2 is fixed to the end 15 of the wind duct in the burner through the insulating component 23; a magnetic control component 25 is also provided at the rear end of the insulating component 23, and the magnetic control component 25 is composed of an electromagnetic coil and installed at the rear of the insulating component 23.

[0032] The rest is the same as in Example 1

[0033] Example 3

[0034] Reference Figure 6-7 The discharge component 21 of the plasma flame catalytic device 2 described in this embodiment is fixed on the inner wind duct wall 14 and the inner wind duct end 15 of the burner through the insulating component 23 respectively.

[0035] The rest is the same as in Example 1

[0036] Example 4

[0037] Reference Figure 8-10 The plasma flame catalytic device 1 of this embodiment is arranged at the outlet 16 of the inner wind duct. The discharge component 21 of the plasma flame catalytic device 2 is an annular electrode, and the conductive component 22 is an annular electrode. The discharge component 21 is connected to the conductive component 22 through the insulating component 23, and the power supply device is connected to the discharge component 21 and the conductive component 22 through a cable arranged in the central air duct 10.

[0038] The rest is the same as in Example 1

[0039] Example 5

[0040] The plasma flame catalytic device 2 of this embodiment is composed of an independent plasma torch installed at the end 15 of the inner wind duct. The plasma torch can directly generate a plasma flame flow.

[0041] The rest is the same as in Example 1

[0042] Those skilled in the art may make various modifications and variations to the present invention. If these modifications and variations are within the scope of the claims of the present invention and their equivalents, then these modifications and variations are also within the protection scope of the present invention.

[0043] The contents not described in detail in the specification are prior art known to those skilled in the art.

Claims

1. A plasma flame catalytic activated coal powder burner for cement plants, comprising a multi-channel coal injection pipe and a plasma flame catalytic device, wherein the multi-channel coal injection pipe is provided with at least an inner air duct, a coal powder channel and an outer air duct, and is characterized in that: The plasma flame catalytic device is arranged in the inner wind duct; The plasma flame catalytic device comprises a discharge component, a conductive component and an insulating component, wherein at least one end of the discharge component is located in the inner wind duct, and the insulating component is connected to the discharge component to fix the discharge component and isolate the conductive component; The discharge component is installed on the inner wall of the inner wind duct and / or the end of the inner wind duct and / or the outlet of the inner wind duct; The inner wall of the inner wind duct of the plasma flame catalytic device is a conductive component, or the conductive component is installed on the inner wall of the inner wind duct.

2. The plasma flame catalytic activated coal powder burner for cement plants according to claim 1, characterized in that: The multi-channel coal injection pipe includes a coal injection pipe with 3 to 6 channels.

3. The plasma flame catalytic activated coal powder burner for cement plants according to claim 1, characterized in that: The plasma flame catalytic device also includes a power supply device, which is connected to the discharge component and the conductive component respectively, or one end of the power supply device is connected to the discharge component, and the other end thereof is grounded with the conductive component.

4. The plasma flame catalytic activated coal powder burner for cement plants according to claim 1, characterized in that: The pulverized coal burner is also provided with a magnetic control component, which is composed of an electromagnetic coil or a permanent magnetic material.

5. The plasma flame catalytic activated pulverized coal burner for cement plants according to claim 3, characterized in that: The pulverized coal burner is also provided with a magnetic control component, which is composed of an electromagnetic coil or a permanent magnetic material.

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